Throttle-valve.



W? f'nesses Patented June 1,1909.

[fire/72%) W Frank Cl afiaw 4 W A-M ASH marax, n. c.

FRANK c. PAn oW, or DETROIT, MICHIGAN, ASSIGNOR or ONE-HALF To ANTONIO c. PESSANO, or nnrnorr, MICHIGAN.

THROTTLE-VALVE.

V Specification of Letters Patent.

Patented June 1, 1909.

Application filed March 13, 1909. Serial No. 483,244.

To all whom it may concern:

Beit known that I, FRANK C. PAHLow, a citizen ofthe United States of America, residing at Detroit, inthe county of ayne and State of l\/.lichigan,have invented certain new and useful Improvements in Throttle- Valves, of which the following is a specification, reference being'had therein to the accon'ipanying drawings.

The invention relates particularly to throttle valves forpneumatictools, such as hammers, drills, and the like, and consists in the novel and simple construction of the valve mechanism, and in the peculiar ar rangement and combination of parts as will be more fully hereinafter set forth.

In the drawings,-Figure l is a view in side, elevation of my improved throttle valve; Fig. is a vertical central section therethrough; and Figs. .3, 4t and 5 are views in elevation of parts of the valve mechanism detached. f

In the drawings thus briefly described, A

- represents a 'valve casing, formed at one end with an elongated tubular extension B, an internal annular shoulder C at the junction of the'extension with the casing proper, and with an external screwithread D upon the extension, as plainly indicated in Fig. 2.

TVithin the valveca'sing is located a controlling valve E, held normally to its seat F by a suitable spring G. The valve, as shown, is provided with a tubular extension H, of a length to project when the valve is seated beyond the shoulder C and slightly within the extension B. I

I represents a tubular member formed with a section J adapted to slide longitudinallywithin the tubular extension B, and when the coupling is efiected to abut against the valve extension and to seat upon the shoulder C. The member I is provided with an enlargement K, externally threaded as at L, and has its end M preferably fashioned for engagement with the pneumatic tool to be operated.

O designatesa coupling sleeve, arranged over the telescoping sections J and B and formed with internal threads at 6 adapted to engage the external threads upon the em gaging sections, inthe" manner indicated in Fig.2." i I In order to'form a tight joint between the parts of the valve mechanism when the Valve is open, I interpose between the shoulder C and the inner end of the section J a suitable packing, as P. Also, for the purpose of preventing independent rotation of upon by the coupling sleeve, I provide a key Q for the parts, which permits only longitudinal sliding movement therebetween. The tubular extension B is formed with a slot (Z therein near its outer end, and the section J with a keyway 6. Before the sleeve is applied to the engaging tubular members, and after the latter have been telescoped, the key is inserted within the slot into engagement with the keyway, and is subsequently held in place by the rotary sleeve, as indicated in Fig. 2.

The operation of the mechanism will be obvious from the foregoing description: the valve being raised from its seat by the rotation of the sleeve in one direction, the ex ternal threads being respectively right and left hand, allowing the motive fluid to pass to the tool, and the passage of the fluid being shut off by the manipulation of the sleeve in the opposite direction, the sleeve acting as a throttle for the device. It will also be noted that at the time the valve is raised from its seat, the inner end of the telescopic member engages the packing so that simultaneous with the operation of the valve an air tight joint is formed.

hat I claim as my invention is,-

1. In a throttle valve, the combination with a valve casing provided with an elongated tubular extension, of a spring-actuated valve within the casing having a projection extending normally within the easing, a member having a tubular portion fitted within the extension for sliding movement and held against relative rotation, and a r0- tatable sleeve for coupling said member and valve casing together.

2. Ina throttle valve, the combination with a valve casing formed with an elongated and externally threaded tubular extension, and an internal annular shoulder at the junction of the extension with the casing proper, of a spring-actuated valve within the casing provided with a projection extending normally beyond the shoulder within the extension, a tubular member fitted within the casing extension for sliding and held against independent rotary movement, and adapted upon sliding movement to engage the valve projection and seat upon the shoulder, an externally threaded enlargement upon the sliding member, and an internally threaded sleeve covering the joint between and engaging the threads upon the telescoping sections.

3. In a throttle valve, the combination with a valve casing, of a slotted tubular extension thereon externally screw-threaded, an internal annular shoulder at the junction of the extension and casing, a spring-pressed valve Within the casing carrying a projection extending normally beyond the shoulder Within the extension, a tubular member arranged Within the casing extension having a keyway formed longitudinally in its Wall opposite the extension slot, a packing interposed between the inner end of said tubular member and the annular shoulder, an externally threaded enlargement upon said member, a detachable key engaging the keyWay and slot, and an internally screw-threaded sleeve covering the oint between the tubular extension and member and the slot in the former and engaging the external screwthreads.

In testimony whereof I aflix my signature in presence of tWo Witnesses.

F RANK C. PAHLOVV. lVitnesses CHARLES SHORT, JOHN J. BELL. 

